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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.zep.asm

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2021-01-12 23:26:43 +00:00
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;<3B><> <20><>
;<3B><> ZEP <20><>
;<3B><> <20><>
;<3B><> Created: 12-Nov-92 <20><>
;<3B><> Passes: 5 Analysis Options on: none <20><>
;<3B><> <20><>
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
data_1e equ 0A0h
data_9e equ 418h ;*
seg_a segment byte public
assume cs:seg_a, ds:seg_a
org 100h
zep proc far
start:
jmp short loc_1
db 90h
data_2 db 0
data_3 dw 216h
db 2
data_4 dw 0
db 'TheDraw COM file Screen Save'
db 1Ah
data_5 db 'Unsupported Video Mode', 0Dh, 0Ah
db '$'
loc_1:
mov ah,0Fh
int 10h ; Video display ah=functn 0Fh
; get state, al=mode, bh=page
; ah=columns on screen
mov bx,0B800h
cmp al,2
je loc_2 ; Jump if equal
cmp al,3
je loc_2 ; Jump if equal
mov data_2,0
mov bx,0B000h
cmp al,7
je loc_2 ; Jump if equal
mov dx,offset data_5 ; ('Unsupported Video Mode')
mov ah,9
int 21h ; DOS Services ah=function 09h
; display char string at ds:dx
retn
loc_2:
mov es,bx
mov di,data_4
mov si,offset data_6
mov dx,3DAh
mov bl,9
mov cx,data_3
cld ; Clear direction
xor ax,ax ; Zero register
locloop_4:
lodsb ; String [si] to al
cmp al,1Bh
jne loc_5 ; Jump if not equal
xor ah,80h
jmp short loc_20
loc_5:
cmp al,10h
jae loc_8 ; Jump if above or =
and ah,0F0h
or ah,al
jmp short loc_20
loc_8:
cmp al,18h
je loc_11 ; Jump if equal
jnc loc_12 ; Jump if carry=0
sub al,10h
add al,al
add al,al
add al,al
add al,al
and ah,8Fh
or ah,al
jmp short loc_20
loc_11:
mov di,data_4
add di,data_1e
mov data_4,di
jmp short loc_20
loc_12:
mov bp,cx
mov cx,1
cmp al,19h
jne loc_13 ; Jump if not equal
lodsb ; String [si] to al
mov cl,al
mov al,20h ; ' '
dec bp
jmp short loc_14
loc_13:
cmp al,1Ah
jne loc_15 ; Jump if not equal
lodsb ; String [si] to al
dec bp
mov cl,al
lodsb ; String [si] to al
dec bp
loc_14:
inc cx
loc_15:
cmp data_2,0
je loc_18 ; Jump if equal
mov bh,al
locloop_16:
in al,dx ; port 3DAh, CGA/EGA vid status
rcr al,1 ; Rotate thru carry
jc locloop_16 ; Jump if carry Set
loc_17:
in al,dx ; port 3DAh, CGA/EGA vid status
and al,bl
jnz loc_17 ; Jump if not zero
mov al,bh
stosw ; Store ax to es:[di]
loop locloop_16 ; Loop if cx > 0
jmp short loc_19
loc_18:
rep stosw ; Rep when cx >0 Store ax to es:[di]
loc_19:
mov cx,bp
loc_20:
jcxz loc_ret_21 ; Jump if cx=0
loop locloop_4 ; Loop if cx > 0
loc_ret_21:
retn
data_6 db 9
db 10h, 19h, 45h, 18h, 19h, 1Bh
db 01h,0D5h,0CDh,0CDh,0B8h, 04h
db 0F3h, 09h,0A9h, 04h, 9Dh
db 9
db 0AAh, 04h,0F2h, 01h,0D5h,0CDh
db 0CDh,0B8h, 19h, 1Ch, 18h, 19h
db 12h,0D5h, 1Ah, 0Ah,0CDh,0BEh
db 20h, 09h, 5Ch, 04h,0F6h, 09h
db 2Fh, 20h, 01h,0D4h, 1Ah, 0Ah
db 0CDh,0B8h, 19h, 13h, 18h, 19h
db 03h,0C9h, 1Ah, 0Dh,0CDh,0BEh
db 19h, 03h, 0Fh,0D2h,0B7h, 19h
db 04h,0D6h, 1Ah, 03h,0C4h,0B7h
db 20h,0D2h,0D2h,0C4h,0C4h,0C4h
db 0B7h, 19h, 04h, 01h,0D4h, 1Ah
db 0Eh,0CDh,0BBh, 19h, 03h, 18h
db 19h, 03h,0BAh, 19h, 12h, 07h
db 0BAh,0BAh, 19h, 04h,0BAh, 19h
db 03h,0BDh, 20h,0BAh,0BAh, 19h
db 02h,0D3h,0B7h, 19h, 13h, 01h
db 0BAh, 19h, 03h, 18h, 19h, 03h
db 0BAh, 19h, 07h, 0Bh, 1Ah, 02h
db 04h, 19h, 07h, 08h,0BAh,0B6h
db 19h, 04h,0C7h,0C4h,0B6h, 19h
db 03h,0BAh,0B6h, 19h, 03h,0BAh
db 19h, 07h, 0Bh, 1Ah, 02h, 04h
db 19h, 08h, 01h,0BAh, 19h, 03h
db 18h,0D6h,0C4h,0C4h, 20h,0BAh
db 19h, 12h, 08h,0BAh,0D3h, 19h
db 02h,0B7h, 20h,0BAh, 19h, 03h
db 0B7h, 20h,0BAh,0D3h, 19h, 02h
db 0D6h,0BDh, 19h, 13h, 01h,0BAh
db 20h,0C4h,0C4h,0B7h, 18h,0D3h
db 0C4h,0C4h,0C4h,0BDh, 19h, 12h
db 08h,0D3h, 1Ah, 03h,0C4h,0BDh
db 20h,0D3h, 1Ah, 03h,0C4h,0BDh
db 20h,0D0h, 1Ah, 03h,0C4h,0BDh
db 19h, 14h, 01h,0D3h,0C4h,0C4h
db 0C4h,0BDh, 18h, 04h, 1Ah, 04h
db 3Eh, 19h, 03h, 0Fh,0D6h, 1Ah
db 04h,0C4h,0B7h, 20h,0D6h, 1Ah
db 03h,0C4h,0B7h, 20h,0D2h,0D2h
db 0C4h,0C4h,0C4h,0B7h, 20h,0D2h
db 0D2h,0C4h,0C4h,0C4h,0B7h, 20h
db 0D6h, 1Ah, 03h,0C4h,0B7h, 20h
db 0D2h,0B7h, 19h, 04h,0D2h, 20h
db 20h,0D2h,0D2h,0C4h,0C4h,0C4h
db 0B7h, 19h, 03h, 04h, 1Ah, 04h
db 3Ch, 18h, 01h,0D6h,0C4h,0C4h
db 0C4h,0B7h, 19h, 07h, 07h,0D6h
db 0C4h,0BDh
dd 319BA20h ; Data table (indexed access)
db 0BDh, 20h,0BAh,0BDh, 19h, 02h
db 0BAh, 20h,0BAh,0BDh, 19h, 02h
db 0BAh, 20h,0BAh, 19h, 03h,0BDh
db 20h,0BAh,0BAh, 19h, 04h,0BAh
db 20h, 20h,0BAh,0BAh, 19h, 02h
db 0BAh, 19h, 03h, 01h,0D6h,0C4h
db 0C4h,0C4h,0B7h, 18h,0D3h,0C4h
db 0C4h, 20h,0BAh, 19h, 06h, 08h
db 58h, 19h, 03h,0C7h,0C4h,0B6h
db 19h, 03h,0BAh, 1Ah, 03h,0C4h
db 0BDh, 20h,0BAh, 1Ah, 03h,0C4h
db 0BDh, 20h,0C7h,0C4h,0B6h, 19h
db 03h,0BAh,0B6h, 19h, 04h,0BAh
db 20h, 20h,0BAh,0B6h, 19h, 02h
db 0BAh, 19h, 03h, 01h,0BAh, 20h
db 0C4h,0C4h,0BDh, 18h, 19h, 03h
db 0BAh, 19h, 03h, 08h,0D6h,0C4h
db 0BDh, 19h, 04h,0BAh, 19h, 03h
db 0B7h, 20h,0BAh, 19h, 05h,0BAh
db 19h, 05h,0BAh, 19h, 03h,0B7h
db 20h,0BAh,0D3h, 19h, 02h,0B7h
db 20h,0BAh, 20h, 20h,0BAh,0D3h
db 19h, 02h,0BAh, 19h, 03h, 01h
db 0BAh, 19h, 03h, 18h, 19h, 03h
db 0BAh, 19h, 03h, 08h,0D3h, 1Ah
db 04h,0C4h,0BDh, 20h,0D3h, 1Ah
db 03h,0C4h,0BDh, 20h,0BDh, 19h
db 05h,0BDh, 19h, 05h,0D3h, 1Ah
db 03h,0C4h,0BDh, 20h,0D3h, 1Ah
db 03h,0C4h,0BDh, 20h,0D0h, 20h
db 20h,0D0h, 19h, 03h,0D0h, 19h
db 03h, 01h,0BAh, 19h, 03h, 18h
db 19h, 03h,0C8h, 1Ah, 15h,0CDh
db 0B8h, 19h, 0Ch,0D5h, 1Ah, 16h
db 0CDh,0BCh, 19h, 03h, 18h, 19h
db 1Ah,0D4h,0CDh, 04h, 1Ah, 03h
db 0F7h, 09h, 2Fh, 04h,0EAh, 09h
db 5Ch, 04h, 1Ah, 03h,0F7h, 01h
db 0CDh,0BEh, 19h, 1Bh, 18h
zep endp
seg_a ends
end start
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